/*
 * Copyright (C) 2013 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.neolix.watch.bluetooth;

import android.app.Service;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothGatt;
import android.bluetooth.BluetoothGattCallback;
import android.bluetooth.BluetoothGattCharacteristic;
import android.bluetooth.BluetoothGattDescriptor;
import android.bluetooth.BluetoothGattService;
import android.bluetooth.BluetoothManager;
import android.bluetooth.BluetoothProfile;
import android.content.Context;
import android.content.Intent;
import android.os.Binder;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.util.Log;

import com.neolix.watch.service.AlarmManagerBroadcastReceiver;
import com.neolix.watch.util.ByteUtil;
import com.neolix.watch.util.SharedPreferencesUtil;
import com.neolix.watch.util.StringUtil;

import org.joda.time.DateTime;

import java.io.UnsupportedEncodingException;
import java.util.LinkedList;
import java.util.List;
import java.util.Queue;
import java.util.UUID;

import static com.neolix.watch.service.AlarmManagerBroadcastReceiver.cancelAlarm;
import static com.neolix.watch.service.AlarmManagerBroadcastReceiver.enableAlarm;
import static com.neolix.watch.util.SharedPreferencesUtil.getLastBluetoothDeviceAddress;
import static com.neolix.watch.util.SharedPreferencesUtil.saveLastBluetoothDeviceAddress;
import static com.neolix.watch.util.StringUtil.isNotBlank;

/**
 * Service for managing connection and data communication with a GATT server hosted on a
 * given Bluetooth LE device.
 */
public class BluetoothLeService extends Service {
    private final static String TAG = BluetoothLeService.class.getSimpleName();

    private BluetoothManager mBluetoothManager;
    private BluetoothAdapter mBluetoothAdapter;
    private String mBluetoothDeviceAddress;
    private BluetoothGatt mBluetoothGatt;
    private String deviceName;

    private int mConnectionState = STATE_DISCONNECTED;
    public static final int STATE_DISCONNECTED = 0;
    public static final int STATE_CONNECTING = 1;
    public static final int STATE_CONNECTED = 2;

    public final static String ACTION_GATT_CONNECTED =
            "com.example.bluetooth.le.ACTION_GATT_CONNECTED";
    public final static String ACTION_GATT_DISCONNECTED =
            "com.example.bluetooth.le.ACTION_GATT_DISCONNECTED";
    public final static String ACTION_GATT_SERVICES_DISCOVERED =
            "com.example.bluetooth.le.ACTION_GATT_SERVICES_DISCOVERED";
    public final static String ACTION_DATA_AVAILABLE =
            "com.example.bluetooth.le.ACTION_DATA_AVAILABLE";
    public final static String EXTRA_DATA =
            "com.example.bluetooth.le.EXTRA_DATA";

    public final static UUID UUID_HEART_RATE_MEASUREMENT =
            UUID.fromString(SampleGattAttributes.HEART_RATE_MEASUREMENT);

    private Queue<BluetoothData> dataQueue = new LinkedList<BluetoothData>();
    private String findDeviceAddress;


    // Implements callback methods for GATT events that the app cares about.  For example,
    // connection change and services discovered.
    private final BluetoothGattCallback mGattCallback = new BluetoothGattCallback() {
        @Override
        public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
            String intentAction;
            Log.i(TAG, "连接状态" + newState);
            if (newState == BluetoothProfile.STATE_CONNECTED) {
                intentAction = ACTION_GATT_CONNECTED;
                mConnectionState = STATE_CONNECTED;
                broadcastUpdate(intentAction);
                Log.i(TAG, "Connected to GATT server.");
                // Attempts to discover services after successful connection.
                Log.i(TAG, "Attempting to start service discovery:" +
                        mBluetoothGatt.discoverServices());


            } else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
                intentAction = ACTION_GATT_DISCONNECTED;
                mConnectionState = STATE_DISCONNECTED;
                Log.i(TAG, "Disconnected from GATT server.");
                broadcastUpdate(intentAction);
                stopSendDataService();
            }
        }

        @Override
        public void onServicesDiscovered(BluetoothGatt gatt, int status) {
            Log.i(TAG, "onServicesDiscovered received: " + status);
            if (status == BluetoothGatt.GATT_SUCCESS) {
                broadcastUpdate(ACTION_GATT_SERVICES_DISCOVERED);
//                new Thread() {
//                    @Override
//                    public void run() {
//                        try {
//                            Thread.sleep(100);
//                            BlueToothUtil.syncDateTime(DateTime.now());
//                            Thread.sleep(1000);
//                        } catch (InterruptedException e) {
//                            e.printStackTrace();
//                        }
//                        BlueToothUtil.enableCharacteristic();
//                        enableAlarm(getApplicationContext());
//                    }
//                }.start();


                new Thread() {
                    @Override
                    public void run() {
                        try {
                            Thread.sleep(100);
                            Intent intent = new Intent(getApplicationContext(), SendDataService.class);
                            startService(intent);
//                            Thread.sleep(1000);
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                        BlueToothUtil.enableCharacteristic();
                        enableAlarm(getApplicationContext());
                    }
                }.start();
                BlueToothUtil.syncDateTime(DateTime.now());
                if (mBluetoothAdapter != null)
                    BlueToothUtil.syncBluetoothName(mBluetoothAdapter.getName());
                saveLastBluetoothDeviceAddress(mBluetoothDeviceAddress);
            }
        }

        @Override
        public void onCharacteristicRead(BluetoothGatt gatt,
                                         BluetoothGattCharacteristic characteristic,
                                         int status) {

            Log.i(TAG, "onCharacteristicRead:" + characteristic.getUuid() + "status" + status);
            if (status == BluetoothGatt.GATT_SUCCESS) {
                readBroadcastUpdate(characteristic);
            }
        }

        @Override
        public void onCharacteristicChanged(BluetoothGatt gatt,
                                            BluetoothGattCharacteristic characteristic) {
            Log.i(TAG, "onCharacteristicChanged:" + characteristic.getUuid());
            readBroadcastUpdate(characteristic);
        }

        @Override
        public void onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
            Log.i(TAG, "onCharacteristicWrite:" + characteristic.getUuid() + "status:" + status);
            writeBroadcastUpdate(characteristic, status);
            super.onCharacteristicWrite(gatt, characteristic, status);
        }

        @Override
        public void onReliableWriteCompleted(BluetoothGatt gatt, int status) {
            Log.i(TAG, "onReliableWriteCompleted:" + "status:" + status);
            super.onReliableWriteCompleted(gatt, status);
        }

        @Override
        public void onDescriptorRead(BluetoothGatt gatt, BluetoothGattDescriptor descriptor, int status) {
            Log.i(TAG, "onDescriptorRead:" + "status:" + status);
            super.onDescriptorRead(gatt, descriptor, status);
        }

        @Override
        public void onDescriptorWrite(BluetoothGatt gatt, BluetoothGattDescriptor descriptor, int status) {
            Log.i(TAG, "onDescriptorWrite:" + "status:" + status);
            super.onDescriptorWrite(gatt, descriptor, status);
        }

        @Override
        public void onReadRemoteRssi(BluetoothGatt gatt, int rssi, int status) {
            Log.i(TAG, "onReadRemoteRssi:" + "status:" + status);
            super.onReadRemoteRssi(gatt, rssi, status);
        }
    };

    private void stopSendDataService() {
        Intent intent = new Intent(getApplicationContext(), SendDataService.class);
        stopService(intent);
        cancelAlarm(getApplicationContext());
    }

    private void broadcastUpdate(final String action) {
        final Intent intent = new Intent(action);
        sendBroadcast(intent);
    }

    private void readBroadcastUpdate(final BluetoothGattCharacteristic characteristic) {
        final Intent intent = new Intent(WatchCommandType.getReadAction(characteristic.getUuid()));

        // This is special handling for the Heart Rate Measurement profile.  Data parsing is
        // carried out as per profile specifications:
        // http://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml
        if (UUID_HEART_RATE_MEASUREMENT.equals(characteristic.getUuid())) {
            int flag = characteristic.getProperties();
            int format = -1;
            if ((flag & 0x01) != 0) {
                format = BluetoothGattCharacteristic.FORMAT_UINT16;
                Log.d(TAG, "Heart rate format UINT16.");
            } else {
                format = BluetoothGattCharacteristic.FORMAT_UINT8;
                Log.d(TAG, "Heart rate format UINT8.");
            }
            final int heartRate = characteristic.getIntValue(format, 1);
            Log.d(TAG, String.format("Received heart rate: %d", heartRate));
            intent.putExtra(EXTRA_DATA, String.valueOf(heartRate));
        } else if (WatchCommandType.syncSteps.getCharacteristicUUID().equals(characteristic.getUuid())) {
            //同步 计步器 步数
            final byte[] data = characteristic.getValue();
            if (data != null && data.length == 4) {
                int step = ByteUtil.byte2Int(data);
                intent.putExtra(EXTRA_DATA, step);
                Log.d(TAG, "read data:" + step);
            }
        } else if (WatchCommandType.syncActivated.getCharacteristicUUID().equals(characteristic.getUuid())) {
            //同步 计步器 步数
            final byte[] data = characteristic.getValue();
            if (data != null && data.length == 1) {
                intent.putExtra(EXTRA_DATA, data[0] == 0x0 ? false : true);
                Log.d(TAG, "read data:" + (data[0] == 0x0));
            }
        } else {
            // For all other profiles, writes the data formatted in HEX.
            final byte[] data = characteristic.getValue();
            if (data != null && data.length > 0) {
                final StringBuilder stringBuilder = new StringBuilder(data.length);
                for (byte byteChar : data)
                    stringBuilder.append(String.format("%02X ", byteChar));

                String std = "";
                try {
                    std = new String(data, "gbk");
                } catch (UnsupportedEncodingException e) {
                    e.printStackTrace();
                }
                String testData = stringBuilder.toString();
                intent.putExtra(EXTRA_DATA, testData);
                Log.d(TAG, "read data:" + testData);
            }
        }
        sendBroadcast(intent);
    }

    private void writeBroadcastUpdate(final BluetoothGattCharacteristic characteristic, int status) {
        final Intent intent = new Intent(WatchCommandType.getWriteAction(characteristic.getUuid()));
        intent.putExtra(EXTRA_DATA, status);
        sendBroadcast(intent);
    }

    public class LocalBinder extends Binder {
        public BluetoothLeService getService() {
            return BluetoothLeService.this;
        }
    }

    public int getConnectionState() {
        return mConnectionState;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        // 注意使用  startForeground ，id 为 0 将不会显示 notification
        // 设置为前台服务
        startForeground(0, null);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        stopForeground(true);
    }

    @Override
    public IBinder onBind(Intent intent) {
        return mBinder;
    }

    @Override
    public boolean onUnbind(Intent intent) {
        // After using a given device, you should make sure that BluetoothGatt.close() is called
        // such that resources are cleaned up properly.  In this particular example, close() is
        // invoked when the UI is disconnected from the Service.
        close();
        return super.onUnbind(intent);
    }

    private final IBinder mBinder = new LocalBinder();

    /**
     * Initializes a reference to the local Bluetooth adapter.
     *
     * @return Return true if the initialization is successful.
     */
    public boolean initialize() {
        // For API level 18 and above, get a reference to BluetoothAdapter through
        // BluetoothManager.
        if (mBluetoothManager == null) {
            mBluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
            if (mBluetoothManager == null) {
                Log.e(TAG, "Unable to initialize BluetoothManager.");
                return false;
            }
        }

        mBluetoothAdapter = mBluetoothManager.getAdapter();
        if (mBluetoothAdapter == null) {
            Log.e(TAG, "Unable to obtain a BluetoothAdapter.");
            return false;
        }

        return true;
    }

    /**
     * Connects to the GATT server hosted on the Bluetooth LE device.
     *
     * @param address The device address of the destination device.
     * @return Return true if the connection is initiated successfully. The connection result
     * is reported asynchronously through the
     * {@code BluetoothGattCallback#onConnectionStateChange(android.bluetooth.BluetoothGatt, int, int)}
     * callback.
     */
    public boolean connect(final String address) {
        if (mBluetoothAdapter == null || address == null) {
            Log.w(TAG, "BluetoothAdapter not initialized or unspecified address.");
            return false;
        }

        mBluetoothAdapter.stopLeScan(mLeScanCallback);

        // Previously connected device.  Try to reconnect.
//        if (mBluetoothDeviceAddress != null && address.equals(mBluetoothDeviceAddress)
//                && mBluetoothGatt != null) {
//            Log.d(TAG, "Trying to use an existing mBluetoothGatt for connection.");
//            if (mBluetoothGatt.connect()) {
//                mConnectionState = STATE_CONNECTING;
//                return true;
//            } else {
//                return false;
//            }
//        }

        final BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address);
        this.deviceName = device.getName();
        if (deviceName == null) {
            Log.w(TAG, "Device not found.  Unable to connect.");
            this.findDeviceAddress = address;
            mBluetoothAdapter.startLeScan(mLeScanCallback);
            return false;
        }

        // We want to directly connect to the device, so we are setting the autoConnect
        // parameter to false.
        close();

        mBluetoothGatt = device.connectGatt(this, false, mGattCallback);
        Log.d(TAG, "Trying to create a new connection.");
        mBluetoothDeviceAddress = address;
        mConnectionState = STATE_CONNECTING;
        return true;
    }

    public String getDeviceName() {
        return deviceName;
    }

    /**
     * Disconnects an existing connection or cancel a pending connection. The disconnection result
     * is reported asynchronously through the
     * {@code BluetoothGattCallback#onConnectionStateChange(android.bluetooth.BluetoothGatt, int, int)}
     * callback.
     */
    public void disconnect() {
        if (mBluetoothAdapter == null || mBluetoothGatt == null) {
            Log.w(TAG, "BluetoothAdapter not initialized");
            return;
        }
        mBluetoothGatt.disconnect();
    }

    /**
     * After using a given BLE device, the app must call this method to ensure resources are
     * released properly.
     */
    public void close() {
        stopSendDataService();
        mConnectionState = STATE_DISCONNECTED;
        if (mBluetoothGatt == null) {
            return;
        }
        mBluetoothGatt.disconnect();
        mBluetoothGatt.close();
        mBluetoothGatt = null;
    }

    /**
     * Request a read on a given {@code BluetoothGattCharacteristic}. The read result is reported
     * asynchronously through the {@code BluetoothGattCallback#onCharacteristicRead(android.bluetooth.BluetoothGatt, android.bluetooth.BluetoothGattCharacteristic, int)}
     * callback.
     *
     * @param characteristic The characteristic to read from.
     */
    public void readCharacteristic(BluetoothGattCharacteristic characteristic) {
        if (mBluetoothAdapter == null || mBluetoothGatt == null) {
            Log.w(TAG, "BluetoothAdapter not initialized");
            return;
        }
        mBluetoothGatt.readCharacteristic(characteristic);
    }

    /**
     * Enables or disables notification on a give characteristic.
     *
     * @param characteristic Characteristic to act on.
     * @param enabled        If true, enable notification.  False otherwise.
     */
    public boolean setCharacteristicNotification(BluetoothGattCharacteristic characteristic,
                                                 boolean enabled) {
        if (mBluetoothAdapter == null || mBluetoothGatt == null) {
            Log.w(TAG, "BluetoothAdapter not initialized");
            return false;
        }
        boolean result = mBluetoothGatt.setCharacteristicNotification(characteristic, enabled);

        BluetoothGattDescriptor desc = characteristic.getDescriptor(UUID.fromString("00002902-0000-1000-8000-00805f9b34fb"));
        if (desc != null) {
            desc.setValue(enabled ?
                    BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE :
                    BluetoothGattDescriptor.DISABLE_NOTIFICATION_VALUE);
            mBluetoothGatt.writeDescriptor(desc);
        }

        return result;
    }

    /**
     * Retrieves a list of supported GATT services on the connected device. This should be
     * invoked only after {@code BluetoothGatt#discoverServices()} completes successfully.
     *
     * @return A {@code List} of supported services.
     */
    public List<BluetoothGattService> getSupportedGattServices() {
        if (mBluetoothGatt == null) return null;

        return mBluetoothGatt.getServices();
    }


    public BluetoothGattService getService(UUID uuid) {
        return mBluetoothGatt.getService(uuid);
    }

    public BluetoothGattCharacteristic getCharacteristic(BluetoothGattService service, UUID uuid) {
        return service.getCharacteristic(uuid);
    }

    public void writeCharacteristic(BluetoothGattCharacteristic characteristic) {
        if (mBluetoothAdapter == null || mBluetoothGatt == null) {
            Log.w(TAG, "BluetoothAdapter not initialized");
            return;
        }
        mBluetoothGatt.writeCharacteristic(characteristic);
    }

    public synchronized void addBluetoothData(BluetoothData data) {
        dataQueue.offer(data);
//        String lastBluetoothDeviceAddress = getLastBluetoothDeviceAddress();
//        if (BlueToothUtil.isEnable() && isNotBlank(lastBluetoothDeviceAddress) && mConnectionState == STATE_DISCONNECTED) {
//            connect(lastBluetoothDeviceAddress);
//        }
    }

    public synchronized BluetoothData getBluetoothData() {
        return dataQueue.poll();
    }

    private BluetoothAdapter.LeScanCallback mLeScanCallback =
            new BluetoothAdapter.LeScanCallback() {
                @Override
                public void onLeScan(final BluetoothDevice device, int rssi, byte[] scanRecord) {
                    if (device.getAddress().equals(findDeviceAddress)) {
                        mBluetoothAdapter.stopLeScan(mLeScanCallback);
                        connect(device.getAddress());
                    }
                }
            };
}
